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, 22:43, 24 January 2019
The pre-production boards are a series of prototype Wii boards, their existence only being known due to SDK text strings and references in [[all.ini]]. SDK references define each of these boards as a console type; see [[OSGetConsoleType]]. Oddly, PP0 is not mentioned in SDK strings compiled into applications, and PP3 is only mentioned in all.ini.
PP0: Found in SDK header file.
Pre-production board 1, 2-1, 2-2: Found in SDK strings present in all Wii applications and games authorized by Nintendo.
PP3: all.ini
No further information about these boards is known.